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參數(shù)資料
| 型號(hào)： | LTC1627 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Monolithic Synchronous Step-Down Switching Regulator(單片同步步降開關(guān)穩(wěn)壓器) |
| 中文描述： | 單片同步降壓型開關(guān)穩(wěn)壓器（單片同步步降開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 228K |
| 代理商： | LTC1627 |
11
LTC1627
Checking Transient Response
The regulator loop response can be checked by looking at
the load transient response. Switching regulators take
several cycles to respond to a step in load current. When
a load step occurs, V
OUT
immediately shifts by an amount
equal to (
I
LOAD
ESR), where ESR is the effective series
resistance of C
OUT
.
I
LOAD
also begins to charge or dis-
charge C
OUT
, which generates a feedback error signal. The
regulator loop then acts to return V
OUT
to its steady-state
value. During this recovery time V
OUT
can be monitored for
overshoot or ringing that would indicate a stability prob-
lem. The internal compensation provides adequate com-
pensation for most applications. But if additional compen-
sation is required, the I
TH
pin can be used for external
compensation as shown in Figure 7.
A second, more severe transient is caused by switching in
loads with large (>1
μ
F) supply bypass capacitors. The
discharged bypass capacitors are effectively put in parallel
with C
OUT
, causing a rapid drop in V
OUT
. No regulator can
deliver enough current to prevent this problem if the load
switch resistance is low and it is driven quickly. The only
solution is to limit the rise time of the switch drive so that
the load rise time is limited to approximately (25 C
LOAD
).
Thus, a 10
μ
F capacitor would require a 250
μ
s rise time,
limiting the charging current to about 130mA.
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1627. These items are also illustrated graphically in
the layout diagram of Figure 7. Check the following in your
layout:
1. Are the signal and power grounds segregated The
LTC1627 signal ground consists of the resistive
divider, the optional compensation network (R
C
and
C
C1
), C
SS
and C
C2
. The power ground consists of the
(–) plate of C
IN
, the (–) plate of C
OUT
and Pin 4 of the
LTC1627. The power ground traces should be kept
short, direct and wide. The signal ground and power
ground should converge to a common node in a star-
ground configuration.
2. Does the V
FB
pin connect directly to the feedback
resistors The resistive divider R1/R2 must be con-
nected between the (+) plate of C
OUT
and signal ground.
Figure 7. LTC1627 Layout Diagram
C
C2
C
C1
R
C
OPTIONAL
OPTIONAL
C
SS
C
OUT
C
IN
D1
D2
C
V
C
B
L1
R2
R1
BOLD LINES INDICATE
HIGH CURRENT PATHS
1
2
3
4
8
7
6
5
SYNC/FCB
V
DR
V
IN
SW
I
TH
RUN/SS
V
FB
GND
LTC1627
V
IN
1627 F07
+
–
V
OUT
+
–
+
+
APPLICATIOU
W
U
U
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1628-SYNC | High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator |
| LTC1628-PG | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1628I-PG | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1628C | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1628C-PG | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
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| LTC1627CS8#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC1627CS8#TR | 功能描述:IC REG BUCK SYNC ADJ 0.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1627CS8#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
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